22 Bulletin io 316 



extend from the posterior to near the central portion of the fin- 

 al segments. Aperture an elongated slit near the lower portion 

 of the septal plane; length variable. 



Prof. H. B. Brady considers that this form occupies an inter- 

 mediate position between Bidimina inflata and Buliniina rostrata, 

 but the costse of the former are short and extend into stout 

 spines beyond the margin of the chambers, while the costse of 

 Bulimina rostrata are continuous and cover almost the whole 

 test and the segments are either indistin(ft or entirely concealed. 



This species is very common at a depth of 645 feet in the 

 well boring at Norfolk, Va. 



Horizon and locality. — Miocene; Norfolk, Va., common in well 

 borings, depth 645 to 695 feet. 



Geological distribution. — Eocene to Recent. 



Bulimina eiongata. 



Syn. Buliinina elongata d'Orbigny, Foram. Foss. Vien., p. 1S7, pi. xi, 

 figs. 19, 20, 1846. 



Test very much attenuated though tapering but .slightly from 

 end to end; segments short, oval, somewhat irregularly arrang- 

 ed and lobulated at the margins, not smooth as in Bulimina 

 imbiicaia Reu.ss, which it somewhat resembles; primordial end 

 sharply, anterior obtusely rounded; chambers numerous, of ir- 

 regular size and separated by depressed septa; ultimate cham- 

 ber provided on its septal face with a conmia-shaped aperture; 

 length 0.37 mm, 



Horizon and locality . — Miocene; Plum Point, Md., rare. 



Geological distribzction — Lower Tertiary to Recent. 



Genus SPIROLGCULINA d'Orbigny. 



Spiroloculina planulata. 



Syn. Mitiolites planulata Lamarck, Ann. dii Museum, vol. v, p. 352, No. 

 4, 1805.; Anim. sans Vert., vol. vii, p. 613, No. 4, 1822. 

 Spiroloculina planulata Brady, Clial. Rep't, vol. ix, p. 148, pi. ix, 

 fig. 2, a, b, 1884. 

 Test free, calcareous, imperforate, oval, complanate, and only 

 slightly depressed at the center; chambers smooth, compressed, 

 placed alternately on opposite sides of the shell. The peripher- 

 al margins are gently rounded. The aperture is in the form of a 

 narrow high arched or horse-shoe .shaped opening with a projeA- 

 ing tongue at the lower margin; length 0.90 mm, breadth 0.60 mm. 

 I have only one specimen of this interesting species. Accord- 

 ing to Prof. H. B. Brady, recent specimens of this form are found 



